What are factors that contribute to better PR?

I am new here. Just wanted to know from the Pros, what are the factors that make good PR page/site.

 

PR is affected by backlinks, only backlinks. Make sure that you get backlinks from non spammy sites.

 

How often does Google run their PR algorithms.

I have PR0 page and have added several links. And still PR has not improved. Is there a blog where I can read everything about PRs

 

Pagerank is a function of backlinks.

You are refering to toolbar PR, which gets updated quarterly or whatever.

The real PR google keeps to itself, until its exported to the toolbar (which is dated)

 

thanks dcristo,

Is there a article on PRs that you guys will refer? I am dying to learn everything about PR

 

Concentrate less on PR and more on rankings.

 

what do you define as non spammy sites?

 

thanks again for the tip.

So how to improve rankings, again same question, what are the factors?

 

Sites which are created for users and not search engines.

 

>Sites which are created for users and not search engines.

Can you give an example?

 

Content of your site and backlink

 

I've heard .gov and .edu sites are best for increasing ranking, is this true?

 

cnn.com is a site for users not for SEs. If you see a website with lots of keywords in it( keyword stuffing), lots of links and affiliate links, to many bolded text, no useful content, duplicated template, then it's a spammy site